<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
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<div class="container">
    <h2>简单的卡片</h2>
    <div class="card">
        <div class="card-body">简单的卡片</div>
    </div>
</div>

</body>
</html>
